I didn't so much buy a house as inherit a garden.
The "I'll grow anywhere, given an opportunity", purple.
The slightly more sedate white, which, on the whole, prefers sheltered spots
And the pink, which grows in one place only and lends me to believe that when it comes to successful transplanting, I don't have a green thumb,. 
I only have the purple, but they are so pretty and cute.
But, ecar You have sticky weed in amongst your pink ones
Get to it - it wil take over the world if it seeds.
^^^^this spikey stuff
You can feel that it's sticky - rip it out - poste haste
There's parts of the garden, like this, where I can't spray weed killer, so it's a constant battle to get rid of the sticky nuisance.
The trouble with it is, as I'm sure you already know, that it breaks really easily and if you don't get the roots out then it comes back ten fold.
It's a blessing and a curse - at least it means I spend time out in the garden.
they are lovely plants
we had hundreds of the purple ones in our old house and we dug a few out when we moved now 3 years later we have a garden bed full of them again
they make the soil improve also i find because being a ground cover they keep the baking sun of the soil and the worms love that!!
im envious you have all 3 colours 
Violets are one of my most favourite flowers and I love the pink - I haven't seen them before. Do they have a beautiful smell like the purple ones?
Yes, well, a little bit "softer". I'm not sure that's a good description.
